Direct flights from Ontario

Where can you fly nonstop from Ontario (ONT)?

Ontario International Airport (ONT) offers nonstop flights to 28 destinations across the United States, El Salvador and Mexico. The busiest direct routes from ONT are served by Southwest, Frontier, Delta and Alaska, with the most frequent nonstop service to Denver, Seattle and Las Vegas.

Headed abroad without a connection? ONT has direct international flights to Guadalajara, San Salvador and Silao. Use the day filter above to see exactly which routes fly on the day you want to travel. Route data updated September 2026 from observed departures.

Airlines and flight times at ONT

9 airlines fly nonstop out of ONT. Southwest runs the biggest operation — about 217 of the 516 weekly departures (42%), across 12 routes — followed by Alaska and Frontier.

The airlines flying nonstop out of Ontario are Southwest, Alaska, Frontier, American, United, Delta, Volaris, JetBlue and Avianca El Salvador.

On 20 of Ontario's 28 nonstop routes, a single airline has the service to itself — Southwest is the only airline with a nonstop to Sacramento, and Delta the only one to Salt Lake City.

The shortest nonstop out of ONT is Las Vegas at about 42m in the air; the longest is Honolulu at about 5h43m.

Route data updated September 2026 from observed flight departures. Schedules change — always confirm with the airline before booking.